$\lim_{x\to\infty}\left(\frac{x}{\sqrt{x^2+9}}\right)$
$2x+1\ge3x-5$
$2x+y+3z=0$
$\int\frac{4x^2+7x+9}{x^3+4x^2-x-4}dx$
$\left(7a^3b^5-8\right)\left(7a^3b^6+8\right)$
$-2k+\frac{25}{6}k$
$\log5\left(\frac{1}{25}\right)$
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